||Velocity Vector, Ionization Degree, and Temperature of Prominence Fine Structures Observed by Hinode/SOT
||454, The 3rd Hinode Science Meeting
||Schmieder, B.; Mein, P.; Chandra, R.; Molodij, G.; Heinzel, P.; Berlicki, A.; Schwartz, P.; Fárník, F.; Labrosse, N.; Anzer, U.; Watanabe, T.
||Prominences have been successfully observed by Hinode in April 2007
exhibiting a strong dynamics of their fine structures. The
dynamics of a prominence is a challenge to understand the
formation of cool prominence plasma embedded in the hot corona.
Combining simultaneous observations obtained in Hα with
Hinode/SOT and the MSDP spectrograph operating at the Meudon solar
tower, velocity vectors have been derived. The Doppler-shifts of
bright threads are of the same order as the velocities measured
perpendicular to the line of sight. This suggests that the vertical
structures of the prominence could be a pile up of dips in
magnetic field lines viewed in 3D. Using Hα,
Hinode/XRT and TRACE data, the hydrogen ionization degree has
been determined to be 0.5–0.8, and the optical thickness in
Hα between 0.2 and 1.3. The Extreme Ultraviolet Imaging
Spectrometer (EIS) on Hinode produced images of the
prominence in 11 selected lines with formation temperatures between
log(T) = 4.7 and log(T) = 6.1. We comment on the
absorption, emissivity blocking and emission involved for
interpreting the different structures of the prominence in terms of
the temperature and density.